Steam-boiler



R. GARSTANG. STEAM BOILBR.

No. 28,051. Patented July 1G, 1883,

'Nrrsn Srnrns PATENT Ormes.

RICHARD GARS'IANG, OF ST.` LOUIS, MISSOURI.

STEAM-Bomen.

SPECIFICATION forming part of Letters Patent No. 281,051, dated July 10, 1883. Application led February 27, 1883. (No medchl To all whomf it may concern:

Be it known that I, RICHARD Gnns'rnne, of the city of St. Louis, in the State of Missouri, have invented a certain new and useful lmprovement in Steam-Boilers, of which the following is a full, clear, and exact description, referencebeing had to the accompanying drawings, forming part of this speeiiication.

'My invention relates to base-burning steamboilers; and my improvement consists in certain details of construction which enhance the usefulness of this form of boiler.

Figure l is an axial section at l l, Fig. 2. Fig. 2 is a transverse horizontal section at 2 2, Fig. l. Fig. 3 is a transverse section at 3 3,

' These tubes extend upward through the firechamber, and their upper ends extend through the crown-sheet C, thus connecting the watercliamber beneath the offset F with the waterchamber I above the crown-sheet. The lower ends of the tubes or pipes G and H are arranged in a ci rele concentric with the shell of the boiler and the wall B. Each alternate tube G is vertical, while the intermediate tubes, H, are inclined inward and pass through the crown-sheet in a circle concentric with but inside the circle passing through the upper ends of pipesor tubes G. (See Figs. 2 and 3.) By means of this arrangement of tubes a circular lire-ch amber is obtained at bottom,where the lire is located, and the'upper parts of the pipes are in more open order to give the products of combustion more freedom to pass among the pipes. Further, the crown-sheet, having much more area than the oiset, needs more extended support,'and this is given by inelining inward each alternate pipe.

.K is the smoke-flue extending axially upward through the chamber I, and connecting with the smoke-stack N by means of a horizontal portion, M.

The base-burning attachment consists of a vertical feed tube, O, passing through the smoke-due, and aliaring lower portion, P, de= scending 'to the lower portion of the firechamber, substantiallyT as shown, where the tubes G and H assume a single circle.

The feed-tube O may be surmounted by a hopper, Q, or by any device for feeding coal into the tube.

I have shown a valve, R, for closing the upper part of the feedtube to prevent the entrance of fuel and the escape of gases. Two valves may be used, one above the other, forming a gas-seal during the act of feeding, the chamber `between the i/'alves being iilled when the upper valve is open, and emptied by opening the lower valve after the upper one has been closed. This feeding arrangement is not novel, and no claim is made therefor. The valve R is shown as operated by the arm S of a bell-crank lever having other arms, T U, carrying, respectively, a hand-rope to open the valve and a weight to close it.

My feed-tube O being formed witha downwardlyila-ring lower portion, the boiler is adapted for use with bituminous coal as fuel,

whereas if the lower end of the tube is drawn in, as in common forms of feeders, bituminous coal would cake and not be burned, for the reason that it jams fast in such tubes.

l. The combination of outer shell, A, inner shell, B, within the outer shell, having crownsheet O, rire-pot having offset F, water-chamber I above the crown-sheet, annular waterchamber between the shells, the water-leg D, surrounding the iire-pot and connected to the upper chamber by means of the annular chamber, and smoke pipe or iiue II, extending from the crown-sheet through the top of theV outer shell, as shown and described.

2. The combination of outer shell, A, inner shell, B, having annular water-chamber be` tween them, water-chamber I, above the inner shell, water-leg D, surrounding the lire-pot beneath the inner shell, .smokel'lue K, conuecting the top of the rire-chamber to the top of the outer shell through the upper water-chan1 ber, and vertical feed-pipe O, extending down through the smoke ilue, and provided with iiaring lower portion, l), descending to the IOO between the shells, connecting the water-leg to the upper chamber on the outside of thev re-cha1nber, the straight tubes G H, connect ing the water-leg to the upper chamber on the inside of the fire-chamber through the offset and crown-sheet, and a smoke-flue extending from the crown through the top of the outerv shell, as set forth.

4. A steam-boiler consisting of outer shell, A, inner shell, B, having crown-sheet C, rire pot having loffset F to support inner shell, water-space between the shells, around, above, and beneath the inner shell, water-tubes connecting the lower and upper water-chan1bers, I D, inside the inner shell, smoke-Hue K, passing through crown-sheet and top of outer shell, and feeder O, extending down through the surrounding the fire-pot, annular water-chamber as shown and smokefue, and provided with flaring portion P at its lower end, as set forth.

5. In a steam-boiler, the combination of inner and outer shells, B A, having water-space between them, straight tubes G H, connecting the upper water-chamber to the water-leg, arranged in a single circle at bottom, and alternately projected inwardly at top to form two circles to expose the upper ends of the tubes to the products of combustion, and a vcentral smoke-flue, K, as set forth.

6. In a steam-boiler, the combination of inner and outer shells, B A, upper, lower, and connecting water-spaces between the shells, straight water-tubes on the inside of the inner shell, forming a single circle at bottom and two circles at top, as shown, anda feeder, O, having Haring lower portion, P, conforming 'to the incline ofthe vtubes I-I, as'set'forth.

RICHARD GABSTANG. 

